125 lines
4.2 KiB
Java
125 lines
4.2 KiB
Java
package it.cavallium.dbengine.database.disk;
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import static it.cavallium.dbengine.database.LLUtils.MARKER_ROCKSDB;
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import static it.cavallium.dbengine.database.LLUtils.generateCustomReadOptions;
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import static it.cavallium.dbengine.database.LLUtils.isBoundedRange;
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import static it.cavallium.dbengine.utils.StreamUtils.resourceStream;
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import static it.cavallium.dbengine.utils.StreamUtils.streamWhileNonNull;
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import com.google.common.collect.Iterators;
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import com.google.common.collect.Streams;
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import it.cavallium.buffer.Buf;
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import it.cavallium.dbengine.database.LLRange;
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import it.cavallium.dbengine.database.LLUtils;
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import it.cavallium.dbengine.database.disk.rocksdb.LLReadOptions;
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import it.cavallium.dbengine.utils.DBException;
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import it.cavallium.dbengine.utils.StreamUtils;
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import java.io.IOException;
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import java.util.Objects;
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import java.util.concurrent.CompletionException;
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import java.util.function.Supplier;
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import java.util.stream.Stream;
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import org.apache.logging.log4j.LogManager;
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import org.apache.logging.log4j.Logger;
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import org.rocksdb.ReadOptions;
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import org.rocksdb.RocksDBException;
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public class LLLocalKeyPrefixReactiveRocksIterator {
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protected static final Logger logger = LogManager.getLogger(LLLocalKeyPrefixReactiveRocksIterator.class);
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private final RocksDBColumn db;
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private final int prefixLength;
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private final LLRange range;
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private final Supplier<LLReadOptions> readOptions;
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private final boolean canFillCache;
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private final boolean smallRange;
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public LLLocalKeyPrefixReactiveRocksIterator(RocksDBColumn db,
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int prefixLength,
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LLRange range,
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Supplier<LLReadOptions> readOptions,
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boolean canFillCache,
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boolean smallRange) {
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this.db = db;
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this.prefixLength = prefixLength;
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this.range = range;
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this.readOptions = readOptions != null ? readOptions : LLReadOptions::new;
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this.canFillCache = canFillCache;
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this.smallRange = smallRange;
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}
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public Stream<Buf> stream() {
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try {
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return resourceStream(
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() -> generateCustomReadOptions(this.readOptions.get(), canFillCache, isBoundedRange(range), smallRange),
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readOptions -> resourceStream(
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() -> db.newRocksIterator(readOptions, range, false),
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rocksIterator -> streamWhileNonNull(() -> {
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try {
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if (logger.isTraceEnabled()) {
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logger.trace(MARKER_ROCKSDB, "Range {} started", LLUtils.toStringSafe(range));
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}
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Buf firstGroupKey = null;
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while (rocksIterator.isValid()) {
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// Note that the underlying array is subject to changes!
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Buf key = rocksIterator.keyBuf();
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var keyLen = key.size();
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if (keyLen >= prefixLength) {
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if (firstGroupKey == null) {
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firstGroupKey = key.copy();
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assert firstGroupKey == null || firstGroupKey.size() >= prefixLength;
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} else if (!LLUtils.equals(firstGroupKey,
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0,
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key,
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0,
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prefixLength
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)) {
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break;
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}
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} else {
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logger.error("Skipped a key with length {}, the expected minimum prefix key length is {}!"
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+ " This key will be dropped", key.size(), prefixLength);
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}
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rocksIterator.next();
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}
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if (firstGroupKey != null) {
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var groupKeyPrefix = firstGroupKey.subList(0, prefixLength);
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if (logger.isTraceEnabled()) {
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logger.trace(MARKER_ROCKSDB,
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"Range {} is reading prefix {}",
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LLUtils.toStringSafe(range),
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LLUtils.toStringSafe(groupKeyPrefix)
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);
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}
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return groupKeyPrefix;
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} else {
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if (logger.isTraceEnabled()) {
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logger.trace(MARKER_ROCKSDB, "Range {} ended", LLUtils.toStringSafe(range));
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}
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return null;
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}
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} catch (RocksDBException ex) {
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throw new CompletionException(generateRangeFailedException(ex));
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}
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}
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))
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);
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} catch (RocksDBException e) {
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throw generateRangeFailedException(e);
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}
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}
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private DBException generateRangeFailedException(RocksDBException ex) {
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if (logger.isTraceEnabled()) {
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logger.trace(MARKER_ROCKSDB, "Range {} failed", LLUtils.toStringSafe(range));
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}
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throw new DBException("Range failed", ex);
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}
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}
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